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Analog Devices Inc. LTC3533EDE#TRPBF
- Part No.:
- LTC3533EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3533EDE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:14,066
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Product details
Overview
LTC3533EDE#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input synchronous buck-boost DC/DC converter IC designed for single-cell Li-ion or multi-cell alkaline/NiMH power rails where input voltage may fall above, below, or equal to the regulated output. It delivers up to 2A continuous output current at VIN > 3V, supports 1.8V–5.5V input and 1.8V–5.25V output ranges, operates up to 2MHz switching frequency, and achieves up to 96% efficiency via synchronous rectification in handheld instrumentation and smart phone power management.
For engineers reviewing the LTC3533EDE#TRPBF datasheet, LTC3533EDE#TRPBF pinout, LTC3533EDE#TRPBF application, or LTC3533EDE#TRPBF equivalent, key selection considerations include its four-switch buck-boost topology enabling seamless mode transitions, programmable Burst Mode operation (IQ = 40µA), 14-lead 3mm × 4mm DFN package with exposed thermal pad, and integrated short-circuit and thermal protection.
Technical Context
The LTC3533EDE#TRPBF implements a proprietary four-switch synchronous buck-boost architecture with continuous transfer function across buck, buck-boost, and boost regions-controlled by error amplifier output voltage (VC) and phased switch timing. Its voltage-mode PWM control loop uses external RC compensation from FB to VC, with programmable oscillator frequency (300kHz–2MHz) set by RT-to-GND resistor and automatic Burst Mode threshold set by BURST-to-GND resistor.
It integrates dual current-limit circuits: a closed-loop input current limit (4.5A typical) active during normal operation and a high-speed peak current comparator (7A typical) that disables PMOS switch A within 50ns; reverse current limiting (0.5A typical) shuts off NMOS switch D when inductor current goes negative; soft-start is implemented via RUN/SS pin clamping of VC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (2.4V–4.2V) and multi-cell alkaline/NiMH without external LDO pre-regulation. |
| Output Voltage Range | 1.8V to 5.25V - adjustable via resistive divider on FB pin; reference voltage is 1.22V ±2.3% over temperature. |
| Continuous Output Current | 2A at VIN > 3V - enables direct powering of 3.3V/1.5A system rails from 3.6V nominal battery; drops to 0.8A at VIN > 1.8V. |
| Switching Frequency | 300kHz to 2MHz - set by RT resistor; higher frequencies reduce inductor and capacitor size but increase gate charge losses. |
| Quiescent Current (Burst Mode) | 40µA - extends battery life in standby; enters low-power sleep cycles while maintaining regulation under light loads. |
| Efficiency | Up to 96% - achieved via synchronous NMOS/PMOS switches with RDS(ON) of 60mΩ (NMOS) and 80mΩ (PMOS). |
| Shutdown Current | <1µA - ensures minimal battery drain when disabled via RUN/SS pin <0.4V. |
| Package | 14-lead (3mm × 4mm × 0.75mm) DFN with exposed thermal pad - requires PCB soldering of pad for thermal and electrical grounding. |
Pinout & Package
The LTC3533EDE#TRPBF is housed in a thermally enhanced 14-lead plastic DFN package (3mm × 4mm × 0.75mm) with an exposed pad (Pin 15) that must be soldered to PCB ground for thermal dissipation and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming | Resistor from RT to GND sets switching frequency per f(kHz) = 33,170 / RT(kΩ); enables compact filter design at 2MHz. |
| BURST (Pin 2) | Automatic Burst Mode threshold control | Resistor + capacitor to GND programs load-current threshold for entering/exiting Burst Mode; grounding forces Burst Mode, connecting to VIN forces fixed-frequency PWM. |
| SGND (Pin 3) | Signal ground reference | Provides low-noise return path for FB, VC, RUN/SS, and BURST; must be separated from PGND traces to avoid noise coupling into feedback loop. |
| SW1 (Pin 4) | Switch node A/B connection | Connects internal PMOS A and NMOS B; ties to one end of inductor; optional Schottky diode to GND improves light-load efficiency during break-before-make. |
| PGND1, PGND2 (Pins 5, 6) | Power ground for NMOS switches | Low-impedance return for high-current NMOS paths (switches B and C); must be tied directly to exposed pad and thermal plane. |
| SW2 (Pin 7) | Switch node C/D connection | Connects internal NMOS C and PMOS D; ties to other end of inductor; Schottky diode to VOUT required for VOUT > 4.3V to clamp SW2 voltage. |
| VOUT (Pin 8) | Feedback sensing and internal supply | Senses regulated output via resistive divider; also powers internal circuitry from PVOUT rail; requires local ceramic bypass capacitor. |
| PVOUT (Pin 9) | Power output node | High-current output terminal connected to output capacitor; requires low-ESR ceramic capacitor placed adjacent to pin and PGND. |
| VIN (Pin 10) | Internal bias supply | Provides VCC for control logic; powered from PVIN via internal regulator; not intended as primary power path. |
| PVIN (Pin 11) | Main input power supply | Primary high-current input terminal; requires ≥10µF ceramic capacitor placed adjacent to pin and PGND to minimize input ripple and EMI. |
| RUN/SS (Pin 12) | Enable and soft-start control | Voltage <0.4V disables IC; >1.4V enables; >1.6V ensures error amp unclamped; RC network provides controlled ramp-up of VC for inrush current limiting. |
| FB (Pin 13) | Feedback input | Connects to resistive divider midpoint; senses output voltage against 1.22V reference; Thevenin resistance >100kΩ recommended for stable current limiting. |
| VC (Pin 14) | Error amplifier output | Drives switch duty cycle; external RC network from VC to FB sets loop compensation; internally held at optimal voltage during Burst Mode to prevent output transients. |
| Exposed Pad (Pin 15) | Thermal and electrical ground | Must be soldered to PCB ground plane; serves as primary thermal path (θJC = 4.3°C/W) and low-impedance return for all power grounds. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables seamless regulation across VIN > VOUT, VIN ≈ VOUT, and VIN < VOUT without mode-hopping artifacts or output discontinuities. |
| Programmable Burst Mode operation | Reduces quiescent current to 40µA at light loads while maintaining regulation-critical for battery runtime in always-on sensors and modems. |
| Integrated dual current limiting | Combines closed-loop 4.5A input current limit (fold-back to 750mA during short-circuit) and 7A peak current comparator for robust overload protection. |
| Reverse current limiting | Prevents backflow from output to input by disabling NMOS switch D when inductor current reverses beyond 0.5A-essential for load-dump and hot-swap safety. |
| Thermally enhanced DFN package | 3mm × 4mm footprint with exposed pad achieves θJA = 43°C/W, enabling 2A continuous operation without heatsink in compact handheld layouts. |
| Output disconnect in shutdown | Internally isolates VOUT from PVOUT when disabled, preventing battery drain through load-required for zero-power-off states in portable devices. |
Applications
| GSM Modems | Digital Cameras |
|---|---|
Use Scenario: Powering RF transceiver and baseband processor in 2G/3G cellular modules operating from single Li-ion cell (2.7V–4.2V) with 3.3V system rail requirement. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 3.3V at up to 1.5A; maintains regulation as battery discharges below 3.3V and handles transient peaks during TX bursts. Use Value: Eliminates need for separate buck and boost converters; Burst Mode extends talk time by reducing idle current to 40µA while preserving fast wake-up response. | Use Scenario: Supplying image sensor, ISP, and flash LED driver in compact digital cameras powered by two alkaline cells (1.8V–3.2V) requiring stable 3.3V or 5V output. IC Role / Device Role / Timing Role: Single-inductor buck-boost converter supporting both step-down (fresh batteries) and step-up (depleted batteries) without manual reconfiguration. Use Value: Enables consistent performance across full battery life; synchronous rectification sustains >92% efficiency even at 500mA load during video capture. |
| Smart Phones | Handheld Instruments |
Use Scenario: Providing auxiliary 3.3V rail for audio codec, touch controller, or NFC chip in smartphones where main PMIC cannot support variable input range. IC Role / Device Role / Timing Role: Secondary regulator accepting same battery input as main SoC rail; operates in buck-boost region during deep discharge (<3.0V) to sustain peripheral functionality. Use Value: Extends usable battery capacity by ~8% compared to fixed-buck solutions; programmable frequency avoids AM band interference in RF-sensitive zones. | Use Scenario: Powering precision ADC, microcontroller, and display backlight in portable multimeters or oscilloscopes using AA/AAA batteries (1.8V–3.0V) with 3.3V logic requirement. IC Role / Device Role / Timing Role: High-efficiency buck-boost regulator with ultra-low shutdown current (<1µA) ensuring months of shelf life without battery replacement. Use Value: Maintains tight output regulation (±1.5%) across temperature and load; soft-start prevents meter reading glitches during power-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Lower max output current (3A vs 2A), fixed 3.3V/5V options only; no programmable Burst Mode threshold; 2.5V–5.5V input range. | Best suited for cost-sensitive consumer electronics with fixed output requirements; lacks fine-grained light-load optimization for long battery life. | Select TPS63020DSJR when fixed-output, lower-BOM-cost designs outweigh need for programmable efficiency modes and wide VOUT adjustability. |
| MAX77827AEWE+T | Higher integration (I²C interface, power good, thermal foldback); 1.8V–5.5V input, 2.5V–5.2V output; 2.5A max output; Burst Mode IQ = 25µA. | Targeted at advanced PMIC subsystems requiring telemetry and dynamic voltage scaling; larger 20-pin WLP package increases layout complexity. | Select MAX77827AEWE+T when system-level power sequencing, telemetry, or tighter thermal management justify added cost and footprint. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the LTC3533EDE#TRPBF offers superior flexibility in output voltage adjustment (1.8V–5.25V), precise Burst Mode threshold programming, and minimal external component count for space-constrained designs-making it optimal for high-performance portable equipment where efficiency tunability and small solution size are critical.
Availability
LTC3533EDE#TRPBF is available at Aetrix Electronics and suitable for GSM modems, digital cameras, and handheld instruments requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3533EDE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3533EDE#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, engineered specifically for battery-powered portable electronics demanding wide input range, seamless buck-boost operation, and ultra-low quiescent current.
FAQ
What is the maximum continuous output current capability of the LTC3533EDE#TRPBF?
The LTC3533EDE#TRPBF delivers 2A continuous output current when input voltage exceeds 3V, and 0.8A when input voltage is between 1.8V and 3V. This rating assumes proper thermal management via soldered exposed pad and adequate PCB copper area. Peak switch current capability is 7A, supporting transient loads without current-limit activation under typical conditions.
How does the LTC3533EDE#TRPBF handle input voltages both above and below the output voltage?
The LTC3533EDE#TRPBF uses a four-switch synchronous buck-boost topology that dynamically phases internal PMOS and NMOS switches (A–D) to operate seamlessly in buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) modes. Transition between modes is continuous and transparent, with no output disruption or mode-hopping artifacts-enabling stable 3.3V output from a single Li-ion cell across its full 2.7V–4.2V discharge curve.
Can the LTC3533EDE#TRPBF be used with output voltages below 1.8V?
Yes-the LTC3533EDE#TRPBF can regulate down to 400mV in buck mode, but operation below 1.8V requires an external Schottky diode from SW2 to VOUT to maintain conduction path when synchronous switch D's RDS(ON) rises at low VOUT. Note that Burst Mode operation is inhibited below 1V, so fixed-frequency mode must be used for sub-1V outputs.
What is the purpose of the exposed thermal pad on the LTC3533EDE#TRPBF package?
The exposed pad (Pin 15) on the LTC3533EDE#TRPBF serves as both thermal dissipation path (θJC = 4.3°C/W) and electrical ground reference for all power grounds (PGND1, PGND2). It must be soldered to a dedicated PCB copper pour tied to system ground; failure to do so risks thermal shutdown under 2A load and degraded EMI performance due to uncontrolled return currents.
How is Burst Mode operation enabled and configured on the LTC3533EDE#TRPBF?
Burst Mode on the LTC3533EDE#TRPBF is configured via a resistor (RBURST) from BURST pin to GND, setting transition load current per IBURST_ENTER = 17/RBURST and IBURST_EXIT = 19/RBURST (RBURST in kΩ, IBURST in A). A parallel capacitor (≥ COUT·VOUT/60,000 µF) filters noise. Grounding BURST forces Burst Mode; connecting to VIN forces fixed-frequency PWM-enabling host-controlled efficiency optimization.
LTC3533EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 2A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x3)
LTC3533EDE#TRPBF FAQ
1.How can I place an order for LTC3533EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3533EDE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3533EDE#TRPBF reliable?
The price and inventory of LTC3533EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3533EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3533EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3533EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3533EDE#TRPBF?
LTC3533EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3533EDE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3533EDE#TRPBF?
For technical support, including LTC3533EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3533EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3533EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3533EDE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3533EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3533EDE#TRPBF?
All LTC3533EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3533EDE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3533EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3533EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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